Drag-saw



No Model.) Y 2 SheetsSheet 2. J. A. GESELIUS.

DRAG SAW.

No. 520,640. Patented May 29, 1894.

(By %m4 h hind 6601 2165 53 Gedelius.

JOHN AUGUST GESELIUS, OF SPRING VALE, MINNESOTA.

DRAG-SAW.

SPECIFICATION forming part of Letters Patent No. 520,640, dated May 29, 189%. Application filed September 11, 1893. Serial No.485,222. (No model.)

To all whom it may concern.-

Be it known that I, JOHN AUGUST GESELIUS, of Spring Vale, Isanti county, Minnesota, have invented a certain new and Improved Drag- Saw, of which the following is a specification.

My invention relates to drag saws, and the object which I have in View is the provision of a drag saw which may be operated by a single horse, or a very small power engine or other motor. To this end it is necessary to make all parts as light as possible, to use a thin saw blade and connect the parts advantageously for the transmission of power to the vertically movable and free saw frame.

My invention consistsin general in the constructions and combinations hereinafter described and particularly pointed out in the claims.

The invention will be more readily understood by reference to the accompanying drawin gs, in which- Figure 1 is a general perspective view of a drag saw embodying my invention. Fig. 2 is an enlarged longitudinal section showing the manner of supporting the saw frame. Fig. 3 is an enlarged detail plan view showing the trunnion by which the saw frame is pivoted. Fig. 4 is a vertical cross section thereof on the line cc-a: of Fig. 3. Fig. 5 is an end view taken from Fig. 4. Figs. 6 and '7 are front and side views showing the means for raising the saw frame after a out has been finished.

As shown in the drawings, 2-2 represent the bed timbers which rest upon the cross piece 3, and the first timber 4 of the logtrough 5, in which trough are suitable rollers 6 upon which a log is moved.

Pivoted on the timber 2 is a small frame 7 having a series of sharp teeth 8 to be forced down into the timber on the rolls to prevent the same from moving thereon. These dogs are operated by means of the lever 9 pivoted upon the bed frame and connected with the part 7 by a link 10.

Upon the rear ends of the bed timbers I provide standards 11 having bearing boxes 12 to receive the crank shaft 13, upon the outer end of which is a fly wheel 14, while the inner end is provided with the miter gear adapted to engage a larger and horizontally arranged miter gear (see dotted lines Fig. 1)

provided upon the vertical power shaft 15 which has bearings 16 and 17.

On the shaft 15 is a pulley 18 for the driving belt 19 or other connection with a horse power.

About midway of the timbers 2 I provide upright posts 20 having bearings for the cross-shaft or axle 21. This cross-shaft carries the long forwardly projecting supporting arm 22 and the shorterand parallel piece 23, which, with the rear end of the supporting arm is employed as a rest and guide for the rolling trunnion 24 of the saw frame: The construction of this trunnion is shown in Figs. 3, 4 and 5, wherein 25 represents the rod of the saw frame, 26 the long collar or sleeve arranged upon one side thereof, and 27 quills which are secured thereon by the tie bolt 28 passing through all parts. The quills form stud-shafts for the flanged rollers 29 which rest upon the parts 22 and 23 and are prevented from jumping thereon by the overhead guide straps 30 arranged on said parts.

The rod 25 and the saw frame 26 of which it.

forms a part, are thus arranged close to the supporting arm 22, at the end of which is a small flanged pulley 31 arranged at the top and middle bars 26' and 25 of the saw frame, the saw being thus supported on the end of the long arm 22 which, being pivoted, permits the rise and fall of the saw frame. The saw frame is pivotally connected with the crank of the shaft 13 by the pitman bar 32, which is preferably attached to the trunnion as shown. The thin cross-cut saw blade 33 is secured between the lower ends of the sawframe and is made taut by means of the tie rods 34, one or both of which are provided with the turn-buckles 35.

For raising the saw after a out has been made I provide a cord or rope 36 secured to the arm 22 and passing up over the pulley 37, provided on the cross-piece of the raised frame 38 arranged upon the forward ends of the bed timbers 2. The rope passes from thence down over a pulley 39 and beneath a lower pulley 40 provided in said frame, and the end of the rope is carried back and attached t0 the sliding bar 41 for which the horizontal guides 42 are provided on one side of the frame and which is arranged to be op erated by the lever 43, and upon throwing which the supporting arm and saw frame Will be raised to permit a log to be moved under the saw. After the dogs 8 have been forced into the log to prevent the same from sliding in the trough, the lever 43 is free to drop the saw on the top of the log. Upon starting the machine the saw frame will be reciprocated, the trunnion 24 moving back and forward in the guides and the saw frame held in place by the supporting arm 22 and the pulley thereon. The weight of the saw and frame will carry the saw into the log.

To balance the saw for different kinds of work, I provide the lever or pivoted arm attached to the part 51 and carrying the adj ustable weight 52. Acord extends from the end of the lever over suitable pulleys on the standard and thence down to an attachment on the supporting arm 22. By shifting the weight the saw may be more or less counterbalanced to give a heavy or light out as desired.

Having thus described my invention, I claim as new and desire'to secure by Letters Patent 1. The combination, in a drag saw, of a frame, with a pivoted arm, carrying guides arranged in connection with said arm to move therewith, a saw frame provided with a rearwardly extending bar having a rolling trunnion confined in said guides and arranged to reciprocate therein, the parallel bars of said saw frame, a roller and a projection on said arm extendingbetween said parallel bars of said frame, means for raising said arm and therewith the frame, and means for reciprocating the saw frame, substantially as described.

2. The combination, with the frame or base, of the shaft 21 pivoted thereon, the arm and the part 23 carried thereon to oscillate therewith, guides on said arm and said part, the trunnion 24 having rollers to move on said guides, the saw frame having the bar 25 secured on said trunnion, said saw frame being movably supported upon the outer end of said arm, and means for reciprocating said saw frame, substantially as described.

3. The combination, with the base, of the shaft 21 with the long supporting arm, and the bar 23 secured on said shaft, said parts provided with guide surfaces and strips, the trunnion 24:, the saw frame having parallel bars, and the extended bar secured on said trunnion, a projection extending from the end of said arm between the parallel bars of the saw frame to support the latter, the crank shaft having bearings on the rear end of said base, a pitman connecting the crank thereof with the saw frame, means for. raising and lowering said arm and said saw frame, a log carriage beneath the saw and means for securing the log thereon, substantially as described.

4. The combination, with the base, of the standard arranged thereon, the saw frame arranged beneath said standard the pivoted supporting arm having a forward end serving as a guide and support for said saw frame, guides provided on said supporting arm, an arm or rod projecting from the rear end of said saw frame and having a transverse part held in said guides, a pitman connected with said saw frame arm, means for operating said pitman, and means for raising and lowering the outer end of said supporting arm to raise and lower the saw frame, substantially as described.

5. The combination, with the base, of the standard arranged thereon, the saw frame arranged beneath said standard the pivoted supporting arm having a forward end serving as a guide and support for said saw frame, guides provided on said supporting arm, an arm or rod projecting from the rear end of said saw frame and having a transverse part held in said guides, a pitmanconnected with said saw frame arm, means for operating said pitman, means for raising and lowering the outer end of said supporting arm to raise and lower the saw frame, and means for partly counterbalancing the weight of said arm and saw frame, said means consisting of a-pivoted lever 50, an adjustable weight thereon, and means connecting the free end of said lever with said supporting arm, substantially as described.

In testimony whereof I have hereunto set my hand this 21st day of August, 1893.

JOHN AUGUST GESELIUS.

In presence of- ANDREW F. LARsoN, G. F. EKLUND. 

